Basics of Newly Developed Train protection and warning system (TPWS)

A path-breaking technology to avoid train collisions was tested successfully between Navandgi and Mantatti stations in Ranga Reddy district on 16th october. The T-CAS was developed jointly by the Research, Design & Standards Organisation (RDSO) and a Hyderabad-based private organisation.

The new system — Train Collision Avoidance System (TCAS) — is a fusion of Train Protection Warning System (TPWS) and Anti-Collision Device (ACD).

The ACD Network is a Train Collision prevention system invented by Rajaram Bojji and patented by Konkan Railway Corporation Limited (A Public Sector Undertaking of Ministry of Railways, Government of India). ACDs have knowledge embedded intelligence. They take inputs from GPS satellite system for position updates and network among themselves for exchanging information using their data radio modems to take decisions for timely auto-application of brakes to prevent dangerous ‘collisions’, thus forming a ‘Raksha KavachTM‘ (meaning a ‘(Train) Safety shield’).

TPWS operates by a combination of train-borne equipment and track mounted sensors. It automatically applies the brakes on a train that has passed a sensor at a speed higher than it should, thus minimising the consequence of a SPAD.

Train collision avoidance system is designed to detect and prevent collisions between trains. Basic approach can be described by UML activity diagram:

(Picture Courtesy:

Train collision avoidance system receives layout specifications and train movement updates through OpenMQ by XML document.

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